Create README.md

ubuntu/README.md

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+```
+apt update
+apt upgrade
+
+apt install git pkg-config libssl-dev curl mc argon2 ca-certificates net-tools
+
+install -m 0755 -d /etc/apt/keyrings
+
+curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
+
+chmod a+r /etc/apt/keyrings/docker.asc
+
+echo \
+  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
+  $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
+  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
+
+apt-get update
+
+apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
+
+echo "{" > /etc/docker/daemon.json
+echo '  "iptables": false' >> /etc/docker/daemon.json 
+echo "}" >> /etc/docker/daemon.json  
+
+systemctl restart docker
+
+ufw allow in on docker0
+ufw route allow in on docker0
+ufw route allow out on docker0
+
+ufw allow 22
+ufw allow 443
+ufw enable
+
+ufw status verbose
+
+docker run hello-world
+```
+